我正在尝试使用django从数据库提供图像，但是当我添加时
+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
到我的urlpatterns我收到此错误：/：模块对象处的TypeError无法调用
这是回溯：
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
113. resolver_match = resolver.resolve(request.path_info)
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/urls/resolvers.py" in resolve
494. for pattern in self.url_patterns:
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/utils/functional.py" in __get__
36. res = instance.__dict__[self.name] = self.func(instance)
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/urls/resolvers.py" in url_patterns
536. patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/utils/functional.py" in __get__
36. res = instance.__dict__[self.name] = self.func(instance)
File "/home/watch/Documents/projects/herokuapp/venv/lib/python3.6/site-packages/django/urls/resolvers.py" in urlconf_module
529. return import_module(self.urlconf_name)
File "/usr/lib/python3.6/importlib/__init__.py" in import_module
126. return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>" …